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Troubleshooting
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Summary of Contents for Bard QH242D
- Page 1 PACKAGED HEAT PUMP INSTALLATION Models: INSTRUCTIONS QH242D QH302D QH362D QH422D QH482D MIS-1554 Manual: 2100-380 Bard Manufacturing Company Supersedes: Bryan, Ohio 43506 File: Vol II Tab 14 Date: 12-11-00 Since 1914 . . . Moving ahead, just as planned. © Copyright 2000...
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Page 2: Table Of Contents
CONTENTS Start Up Getting Other Information and Publications Description of Standard Equipment ......18 For more information, contact these publishers: ..1 Optional CFM ............18 Important Installer Note ..........18 General Information Phase Monitor ............18 Model Nomenclature ........2 Three Phase Scroll Compressor Start Up Shipping Damage ............ -
Page 3: Getting Other Information And Publications
Getting Other Information and Publications These publications can help you install the air FOR MORE INFORMATION, CONTACT conditioner or heat pump. You can usually find these at THESE PUBLISHERS: your local library or purchase them directly from the publisher. Be sure to consult current edition of each standard. -
Page 4: Qt Ec Model Nomenclature
Series General Information MODEL NOMENCLATURE 2 D A MODEL NUMBER | FILTER OPTIONS COIL OPTIONS QH - QT Model 0Z - 0KW X - 1 Inch Fiberglass X - Standard 05 - 5KW (Standard) 06 - 6KW F - 2 Inch Fiberglass CAPACITY | P - 2 Inch Pleated 24 - 2 Ton... -
Page 5: Table 2 Electrical Specifications
TABLE 2 ELECTRICAL SPECIFICATIONS & Maximum size of the time delay fuse or HACR type circuit breaker for protection of field wiring conductors. Based on 75° C copper wire. All wiring must conform to the National Electrical Code and all local codes. These “Minimum Circuit Ampacity”... -
Page 6: Table 2A Electrical Specifications
TABLE 2A ELECTRICAL SPECIFICATIONS (continued from Page 3) & Maximum size of the time delay fuse or HACR type circuit breaker for protection of field wiring conductors. Based on 75° C copper wire. All wiring must conform to the National Electrical Code and all local codes. These “Minimum Circuit Ampacity”... -
Page 7: Figure 1 Unit Dimensions
FIGURE 1 UNIT DIMENSIONS MIS-1572... -
Page 8: Shipping Damage
FIGURE 2 SHIPPING DAMAGE AIR SEAL UNDER QT UNIT Upon receipt of equipment, the carton should be checked for external signs of shipping damage. The skid must remain attached to the unit until the unit is ready for installation. If damage is found, the receiving party must contact the last carrier immediately, preferably in writing, requesting inspection by the carrier’s agent. -
Page 9: Handling Unit After Removal From Skid
HANDLING UNIT AFTER REMOVAL The wheels of the unit must be locked. If the wheels were allowed to roll, the unit could roll off the cart. FROM SKID The unit should always be carted from the left side. This is the side where the compressor is located. See WARNING Figure 4. -
Page 10: Figure 5 Installation With Free Blow Plenum
FIGURE 5 INSTALLATION WITH FREE BLOW PLENUM CEILING 8 FT. - 6 IN. MINIMUM RECOMMENDED 8 FT. - 4 IN. CEILING HEIGHT MIS-1574 FLOOR FIGURE 6 DUCTED APPLICATION SUSPENDED CEILING DUCT FIXED CEILING 20 IN. MINIMUM DUCT FLANGE 12 IN. MINIMUM 2 IN. -
Page 11: Duct Work
DUCT WORK The QPB and QPBHW Plenum Box mounts on top of the unit and has both vertically and horizontally Any heat pump is more critical of proper operating adjustable louvers on the front discharge grille. charge and an adequate duct system than a straight air When used with a ducted supply, a QCX Cabinet conditioning unit. -
Page 12: Fresh Air Intake
CONDENSATE DRAIN FRESH AIR INTAKE There are two drain connections on the unit. The side This unit is equipped with a fresh air damper assembly. drain is located on the bottom right side of the unit. The damper blade is locked in the closed position when The rear drain is an optional drain, and is located on the the unit is shipped from the Factory. -
Page 13: Service Light
SERVICE LIGHT FIGURE 11 REAR DRAIN (TOP VIEW) The unit is equipped with a service light which signals DRAIN LINE the user that service is required. The light is located in the upper control panel and is visible only when the hinged service/filter access door is open. -
Page 14: Installation Instructions
INSTALLATION INSTRUCTIONS alignment to the mounting brackets. This unit MOUNTING THE UNIT must be level from side to side. If adjustments When installing a QT unit near an interior wall on the are necessary, shim up under the rollers with left side, a minimum of 8 inches is required;... -
Page 15: Wiring - Main Power
WIRING – MAIN POWER The unit rating plate lists a “Maximum Time Delay Relay Fuse” or “HACR Type” circuit breaker that is to Refer to the unit rating plate and/or Table 2 for wire be used with the equipment. The correct size must be sizing information and maximum fuse or “HACR used for proper circuit protection, and also to assure that Type”... -
Page 16: Figure 15 Thermostat Plug Terminals
TABLE 4 WALL THERMOSTATS AND SUBBASE COMBINATIONS c i t t i s t s i FIGURE 15 THERMOSTAT PLUG TERMINALS BLOWER MOTOR P2 AND P4 LOW VOLTAGE PLUG (VIEWED FROM PIN END) (VIEWED FROM PIN END) MIS-1285 Manual 2100-380 Page... -
Page 17: Figure 16 Thermostat Wiring Diagram "E" Option
FIGURE 16 THERMOSTAT WIRING DIAGRAM “E” THERMOSTAT OPTION DEHUMIDIFICATION MODULE 4102-015... - Page 18 Manual 2100-380 Page...
- Page 19 FIGURE 16B REMOTE THERMOSTAT WIRING DIAGRAM “F” THERMOSTAT OPTION DEHUMIDIFICATION MODULE 4102-014...
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Page 20: Start Up
START UP IMPORTANT INSTALLER NOTE DESCRIPTION OF STANDARD EQUIPMENT For improved start-up performance, wash the indoor coil with a dishwasher detergent. Solid State Electronic Heat Pump Control Provides efficient 30 minute defrost cycle. A thermistor sensor and speed up terminal for service along with a 10 PHASE MONITOR minute defrost override are standard on the electronic heat pump control. -
Page 21: Service Hints
All three phase scroll compressors used in the QT f. If unit is attached to duct work, remove upper series are wired identically internally. As a result, once cabinet extension by removing the top center the correct phasing is determined for a specific system screw only from the cabinet side panel. -
Page 22: Vent Options
VENT OPTIONS 2. The power connectors for the CRV (located on the right side of the unit) must be disconnected. BAROMETRIC FRESH AIR DAMPER (Standard) Squeeze the tabs on the sides of the connector and pull straight out. Unplug both of the Before starting, make sure the power has been turned connectors. -
Page 23: Figure 16A Thermostat Wiring Diagram "X" Option16 Figure 16B Thermostat Wiring Diagram "F" Option 17 Figure 17 Fresh Air Damper Removal
FIGURE 17 FRESH AIR DAMPER REMOVAL MOUNTING SCREW BLANK OFF PLATE MIS-1578 Manual 2100-380 Page... -
Page 24: Figure 18 Qerv Removal
FIGURE 18 QERV REMOVAL POWER CONNECTORS MOUNTING SCREWS LOWER BLOWER ASSEMBLY POWER CONNECTOR FRONT FILL MIS-1039 Manual 2100-380 Page... -
Page 25: Sequence Of Operation
SEQUENCE OF OPERATION heating mode the compressor will be stopped. This will activate the right hand red light marked “System Cooling – Circuit R-Y makes the thermostat pull in the Service” on the front of the unit. The lockout circuit compressor contactor starting the compressor and will hold compressor off line. -
Page 26: Refrigerant Tube Schematic For Reheat Coil
When the humidity is above the setpoint of the If the unit is running in heating mode and the humidistat, the compressor circuit and the 3 way valve humidistat calls for dehumidification, the heating mode are energized and the evaporator air flow is reduced. takes precedence over dehumidification. -
Page 27: Figure 19 Dehumidification Mode Circuit
FIGURE 19 DEHUMIDIFICATION MODE CIRCUIT DIAGRAM MIS-1088 Manual 2100-380 Page... -
Page 28: Figure 20 Cooling Mode Circuit
FIGURE 20 COOLING MODE CIRCUIT DIAGRAM MIS-1089 Manual 2100-380 Page... -
Page 29: Figure 21 Heat Pump Control Board
FIGURE 21 HEAT PUMP CONTROL BOARD MIS-973 DEFROST CYCLE If some abnormal or temporary condition such as a high wind causes the heat pump to have a prolonged defrost The defrost cycle is controlled by temperature and time cycle, the heat pump control will restore the system to on the solid state heat pump control. -
Page 30: Troubleshooting
TROUBLESHOOTING TABLE 5 TROUBLESHOOTING t i u , t i t i n . l o a t l n i l . l o c t i c t i c t i c t i a t l . -
Page 31: Solid State Heat Pump Control Troubleshooting Procedure
SOLID STATE HEAT PUMP CONTROL CHECKING TEMPERATURE SENSOR TROUBLESHOOTING PROCEDURE 1. Disconnect temperature sensor from board and from outdoor coil. 1. Turn on AC power supply to indoor and outdoor units. 2. Use an ohmmeter and measure the resistance of the sensor. -
Page 32: Figure 22 Fan Blade Setting
TABLE 7 FAN BLADE SETTING DIMENSIONS FAN BLADE DIMENSIONS Any service work requiring removal or adjustment in the fan and/or motor area will require that the dimensions in Table 7 be checked and blade adjusted in or out of the motor shaft accordingly. FIGURE 22 FAN BLADE SETTING REFRIGERANT CHARGE... -
Page 33: Pressure Charts
TABLE 10 COOLING PRESSURE (All Temperatures in Degrees F) Low side pressure ± 2 psig High side pressure ± 5 psig Tables are based upon rated CFM (airflow) across the evaporator coil. If there is any doubt as to correct operating charge being in the system, the charge should be removed, system evacuated and recharged to serial plate instructions. -
Page 34: Table 11 Heating Pressure
TABLE 11 HEATING PRESSURE (All Temperatures in Degrees F) Manual 2100-380 Page... -
Page 35: Optional Accessories
TABLE 12 OPTIONAL ACCESSORIES e l l ) s l ) s l ) s l ) s l ) s l ) s l " 4 s t i " 4 s t i o l l o l l e t i i n i l l i...
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